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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae546464f758d4697825e9e1445fc40064f30ed040f71db1b973f4e5ce40b7b' 
  AND token = 'Oxsn0ySDonbKiue0bjlMdyzvboh4GWlegwBBdk7JeQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}